Sash pulley



m m w N A E. SCHUMACHER QASH PULLEX Fiied Oct. 10, I925 Aug. 25, 1925.

Patented Aug. 25 1925.

, EBERH'A'RD sc'HUMAoHEn, or PHILADELP IA, PENNSYLVANIA.

SASH PULLEY.

, Application'filed October 10, I923. :Serial No. 667,594.

To all whom it may concern:

Be it known that I, EBERHARD SCHU- Mnomima citizen of theUnited' States, residing at Philadelphia,-in the county of Philadelphia and State of Pennsylvania, have invented certain new-and useful Improvements in Sash Pulleys, of which the following is a specification, reference being had to the accompanying drawings.

My invention relates generally to sash pulleys, more particularly to those consti'ucted wholly of sheet metal; and its *objects are to minimizethe number of con- 'stituent parts with reference both to'the pulley wheel and the casing therefor; to

enable these constituent parts to be secured together without necessity for resortingto riveting, soldering, brazing or welding; andto otherwise simplify the construction of suchpulleys withra view toward securing greater uniformity, as well as effecting V greater economy in production.

How this desiderata may be-secured will become readily apparent from the detailed description whichfollow'sof a typical embodiment'of my invention,

In the drawingsFig. VI is-a side elevation of my improvedfsashpulley. J

Fig.;II is a crosssectionalqvi'e'w of the same taken as indicated by the arrows IIII in Fig. I.

Figs. III and IV are corresponding perspective views of two component sections,

which, when assembled, constitute the cas-- ing of the pulley structure.

Figs. V and VI are perspective views of counterpart halves or sections jointly constituting the pulley wheel.

In the assemblage of Figs. I and II, I

have indicated the casing member of the pulley structure comprehensively by thenumeral 1, and the grooved pulley wheel designed to guide the sash cord or chain, by the numeral 2. The casing 1 it will be noted, has spaced parallel sides, closed rounded ends, is completely surrounded by a face plate, and provided centrally of its opposite ends with reinforcing ribs whose edges are appropriately configured to insure anchorage of the device in the window frame.

The casing 1, I construct of two com ponent halves or sections indicated at A and B, in Figs. I and II and shown detached in Figs. III and IV. The section A to which attention will be first directed,

isstamped; from asheet metal blankwhich is so configured initially as to predetermine the, desired form, upon being pressed into shape. In the course of this operation, one longitudinal edge of the blank is turned laterally to provide a flange 3, this flange being continued about the opposite concaved or quarter rounded ends 441 of the blank.

' Beyond the concaved ends the blank ,is

formed with outwardly extendingfins 6, 6

which are integrally continuous with the bling saw teeth. The medial portion 5 of the blanlris expanded inwardly to fornr a flange 3 and notched along a portion. of their lengths to form projections 7 resemcylindrical axis or embossment which is shouldered at 9, centrally aperturedas indicated at 10, andhas its face in a common plane with the end fins 66. The

casing section B will be observed asibeing exactlysinnlar to the section A except as to the axial aperture 11 of its embossment 8 wh ch aperture is made somewhat smaller than; that of section A for a reason which will presently become apparent.

Coming now to the pulley wheel 2, it

will be seen from 'FigII to comprisetwo disk sections which are separately illustratedgin ,Figs. V; and V;I,fand respectively identified by the letters C, D. These pulley wheel sections C, D, are exact counterparts of one another, the centrally apertured disks from which-they are formed being each so stamped as to provide a concentric annular embossment 14 having a'fiat face 15, a concaved peripheral flange 16, and an outwardly directed rounded bead flange 17 about its central aperture 18, the cross sectional configuration of the flange being seen to the best advantage in Fig. II. Spaced at uniform intervals and in alternation about the flat annular face 15 of each pulley wheel section are projections 19 and depressions 20 which may be conveniently formed incidentally to the stamping operation.

In assembling, the pulley wheel 2 is made up by bringing the annular faces 15 of the component sections 0, D into mutual contact with the projections 19 of the one engaging the depressions 20 of the other. As a result of this inter-engagement, the two parts C,D are held against relative circumferential movement with the central apertures 18 in alignment as well as the concaved pulley groove. The sections C, D are thereupon permanently secured together by a bushing 21 (see Fig. II) which is first placed in position within the aligned central apertures 18 and its ends thereupon turned or rolled over to intimately embrace or overlap the bead flanges l7 and thus to hold the two sections C, D rigidly against spreading subsequently. Nith the pulley wheel 2 assembled as just explained, the central embossments 8 of the two casing sections A, B are next introduced into the bushing 21 from opposite sides of the pulley wheel 2 until they abut as shown in Fig. II, care being exercised at the same time to bring the flanges 3 into alignment to form the face plate, when the notched projecting fins 6-6 will, as a matter of course, fall into mutual contact and coincidence to form the barbed reinforcing ribs at the ends of the casing. With the several parts in these positions, the metal about the aperture 11 of the casing member B is rolled or otherwise turned over to embrace the periphery of the aperture 10 of the companion casing member A is shown at 22 in F II. As a result of the latter procedure, it will be apparent that not only are the easing members A, B rigidly secured together, but the pulley wheel 2 at the same time is permanently incorporated in the assemblage and supported for rotation on the journal axis afforded jointly by the aligned abutting embossments 8, 8, the shoulders 9, 9 of the latter serving to prevent undue lateral freedom of said pulley on its mounting.

Having thus described my invention, I claim:

1. A sash pulley structure comprising a casing embodying two similar abutting opposed sections of sheet metal provided with integral laterally turned and inwardly shouldered embossments jointly affording a cylindrical axis, and with end fins jointly forming reinforcing ribs, said embossments and fins meeting respectively in the plane of abutment of the casing sections, and a pulley wheel rotatable in the casing comprising counterpart interchangeable centrally apertured disk sections of sheet metal formed with concaved peripheries, outwardly projccting beaded flanges surrounding their central apertures, alternating projections and depressions to prevent circumferential displacement, and an axial sleeve having its ends expanded into engagement with the beaded flanges aforesaid to secure the counterpart sections rigidly together.

2. In a sash pulley structure the combination of a casing comprising two similar opposed abutting sections of sheet metal having laterally turned integral flanges and projecting fins along opposite ends with the medial portions of said sections inwardly expanded to afi'ord a shouldered cylindrical axis, and a pulley wheel including counterpart sheet metal disk sections having alternating projections and depressions to prevent circumferential displacement with a central bushing the ends whereof are outwardly expanded to secure said two sections together, and said bushing being rotatable on the casing cylindrical axis.

In testimony whereof, I have hereunto signed my name at Philadelphia, Pennsylvania, this 1st day of October, 1923.

EBERHARD SCI-IUMACHER. 

